1. Motor Information

2. HOUSINGS Shown on the next several slides are a sample of some of the motor housings or enclosures that are available. This is by no means exhaustive.

3. OPEN – Air Over – A.O. Ex.: Furnace Fan

4. Totally Enclosed – Water Proof Ex.: Outdoor Condenser

5. Totally Enclosed Hazardous Location

6. OPEN – Drip Proof

7. Single Phase Motor Types  Split Phase  Shaded Pole  (PSC) – Permanent Split Capacitor  (CS) – Capacitor Start  (CSR) – Capacitor Start Run

8. Three Phase Motor Types  Delta Configuration  Wye Configuration

9. DC Motor that works on AC Known as a ‘Universal’ motor because it can work on AC or DC. It has some unique characteristics that we will review later in the course.

10. Starting Devices All of the following devices are used with single phase motors. 1.Centrifugal Switch 2.Hot Wire Relay – no longer used 3.Current Relay 4.Solid State Relay 5.Potential Relay

11. Starting Devices Three phase motors are ‘self starting’ and do not require a ‘starting relay.’ Because of this, they are easier to troubleshoot.

12. Motor/Compressor Configurations The HVACR industry uses compressors which require a motor to drive the compressor. Therefore, there are three configurations.

13. 1. Hermetic The word hermetic means ‘sealed.’ So both the motor and the compressor share the same shaft and they are both put in a housing and welded closed, thus ‘sealed.’ They are sometimes referred to as a ‘tin can’ or ‘welded’ compressor.

17. 2. Semi-Hermetic (sometimes referred to as semi-open) The motor and the compressor share the same shaft and the housing is accessible. In other words, the motor can be accessed for repair and the compressor can be accessed for repair.

20. 3. Open The motor and the compressor DO NOT share the same shaft and therefore requires a belt or coupling to connect the motor to the compressor.